Issue 38, 2023

Phosphine oxide modulator-ameliorated hole injection for blue perovskite light-emitting diodes

Abstract

Despite the enormous developments in perovskite light-emitting diodes (PeLEDs) recently, obtaining efficient blue PeLEDs is still considered a critical challenge due to the non-radiative recombination and unbalanced charge injection caused by the unmatched carrier mobility and the deep hole-injection barrier between the hole-transport layer (HTL) and the emissive layer (EML). Herein, we incorporate tris(4-trifluoromethylphenyl)phosphine oxide (TMFPPO), obtained through a facile oxidation synthesis process, into poly(9-vinylcarbazole) (PVK). TMFPPO incorporation modulated the energy level and hole mobility of the binary-blend HTLs to eliminate the hole-injection barrier and balance the charge injection within the EML. Consequently, the blue PeLEDs with blended HTL presented an external quantum efficiency (EQE) of 7.23% centred at 477 nm, which was much higher than the EQE of a PVK device (4.95%). Our results demonstrate that modulating the energy level and charge injection of the HTL in the device is a promising method for obtaining efficient blue PeLEDs.

Graphical abstract: Phosphine oxide modulator-ameliorated hole injection for blue perovskite light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
04 Jul 2023
Accepted
04 Sep 2023
First published
20 Sep 2023

J. Mater. Chem. A, 2023,11, 20808-20815

Phosphine oxide modulator-ameliorated hole injection for blue perovskite light-emitting diodes

X. Fan, Y. Wang, X. Shen, Z. Yu, W. H. Jeong, J. W. Jang, Y. G. Kim, S. Woo, H. Ahn, H. Choi, T. Lee, S. H. Park, F. Gao and B. R. Lee, J. Mater. Chem. A, 2023, 11, 20808 DOI: 10.1039/D3TA03910B

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